Please Help with problems 7-10

7) 3m + 21

8) 8t + 12

9) 45 + 30r

10) 32n - 16n or just 16n

Step-by-step explanation:

just use the distributive property

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-XxDeathshotxX

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.